farrow_filter

这是一个基于空时分组编码的MIMO_OFDM通信系统的仿真设计。 此系统包括QPSK调制解调，IFFT调制，空时编解码，基于训 练符号的信道估计等通信模块 (This is a space-time block coding based on MIMO_OFDM Communication System Simulation. This system consists of QPSK modulation and demodulation, IFFT modulation, space-time coding and decoding, symbol-based training channel estimation training and other communication module)

Matlab model of inverter for drive system with motor

白噪声 –单位冲激信号 –正弦信号 –方波信号 –三角波信号 功率谱(White Noise- unit impulse signal- sinusoidal signal- a square wave signal- triangular wave signal power spectrum)

ios下，一个基于XMPP简单的的通信demo(Under ios, an XMPP-based communication simple demo)

Matlab的入门教程PPT 1、MATLAB 7简介 2、MATLAB 7安装方法 3、基本的使用方法 4、数值向量和数组 5、字符串、单元数组和结构 6、符号运算 7、图形运算 8、图形处理 9、GUI图形设计 10、MATLAB 7程序设计(Matlab Tutorial PPT 1, MATLAB 7 Introduction 2, MATLAB 7 installation methods 3, the basic use 4, numerical vectors and arrays 5, strings, cell arrays and structures 6, symbolic computation 7 graphics computing 8 graphics processing 9, GUI Graphic Design 10, MATLAB 7 Programming)

首先根据短训练字的特性进行相关运算，进行信号到达检测，当检测到相关值大于门限一定次数后，认为有信号到达。然后根据长训练字的特性，进行相关运算，进行OFDM符号FFT窗口起始位置的估计。估计出FFT窗口的位置后，先在时域进行小频偏的估计，将两个长训练字进行小频偏补偿后，进行FFT运算，根据FFT运算的结果进行整数倍频偏的估计。这些参数估计完成后，就可以进行数据解调了。先对数据部分进行完整的频偏补偿，然后根据估计的FFT窗口位置进行FFT运算得到频域的数据，进行解调。然后在对应于导频的子载波位置上提取出导频信息，根据导频信息估计出剩余定时误差以及剩余的信道响应误差，将误差量送入环路进行跟踪。当收到所有数据后，重新回到信号到达检测状态，进行下一次信号到达的检测和信号接收。(First, according to the characteristics of the short training word correlation operation, the signal reaching the detector, when the detected correlation value is greater than the threshold after a certain number of times that a signal arrives. And then the characteristics of long training word, the correlation operation for the FFT window starting position of an OFDM symbol estimate. The estimated position of the FFT window, the first small frequency offset in the time domain estimation, the two long training word small frequency offset compensation, the FFT operation, the FFT result of the operation for integer frequency offset estimate. These parameter estimation is completed, the data can be demodulated on. The first portion of the data for a complete frequency offset compensation, and based on the estimated FFT window position of the FFT operation to obtain frequency domain data, demodulated. Then corresponding to the position of the pilot subcarriers are extracted on pilot inform)

一个DataMatrix，RS码的编码例子，用matlab写的，有助于理解里面的算法(A DataMatrix, RS code examples, written with MATLAB, helps to understand the inside algorithm)

说明：  求解MATLAB中关于特征值特征向量、卫星运行问题、动态玫瑰线、二重积分、函数画图问题的分析程序。(Analytical program for solving eigenvalue eigenvector, satellite operation problem, dynamic rose line, double integral and function drawing problem in MATLAB.)

一种基于广义Hough变换的破碎图形的识别方法(Generalized Hough transform based on the recognition of broken graphics)

利用自适应陷波器来消除通信系统中的工频干扰。重点从LMS算法的步长因子、信号与干扰的频率差、参考输入的幅值和相位等几个方面讨论单频陷波器的滤波效果。另外，还以双频为例，讨论了多频级联型陷波器的特性，证实了经过两次滤波后，信号可被真实的恢复出来，且误差收敛趋于稳定。(The use of adaptive notch filter to eliminate the communication system frequency interference. LMS algorithms focus from step factor, the frequency difference signal and interference, refer to the input amplitude and phase of discussions on several aspects of single-frequency notch filter of the filtering effect. In addition, in order to dual-band, for example, discussed the multi-frequency cascade notch filter characteristics, confirmed the filtered twice, the signal can be restored out of true, and the error convergence stable.)